JPH02426Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a horizontally rotating grate machine for processing granular materials in sinter coolers, coke dry chillers, pellet calciners, oil sielers, etc.

When processing granular materials such as iron ore, coke, etc. through processes such as heating or cooling, a grate rotates around a vertical axis between a hood and a wind box with gas trapped above and below it. Horizontal rotating grate machines have been used for a long time, but if we take a coke dry cooling system as an example and explain it, the first,
2 and 3, a number of separate pallets 2 rotating along a circular path in the direction of the arrow Z about a vertical axis 1 connect the inner plate 3 and the outer plate 3' approximately radially. It has a gas-permeable grate 6 attached to the upper surface of a rigid box-shaped frame 5 made up of a plurality of beam members, and a gas-impermeable annular side wall 7 standing upright on the inner and outer peripheries of the pallet.
and 7' to form a trough-shaped coke receiving section 8.
The inner and outer side walls form a rigid frame consisting of annular members 9 and 9' each having a box-shaped cross section, and beams 10 that connect the members and the both side walls substantially radially, and the pallet A support shaft 11 is fixed to the box-shaped frame so that the pallets can be tilted individually, and is pivotally attached to the annular members 9 and 9' through bearings 12 through the both side walls, and further, the pallet is Coke discharge section 13 to be described later
In order to reduce the tilting moment at the pallet and prevent the pallet from tipping over when the coke 15 is fed onto the pallet in the ore feeding section 14 and when the pallet is moving under no load, the center of gravity of the pallet is always slightly lower than the support shaft. It is placed on the backward movement side, that is, on the opposite side of the arrow direction Z, and is supported by being placed on the beam for connecting the side wall that is arranged in parallel on the backward movement side of the support shaft, and furthermore, on both the inner and outer sides of the support shaft. The wall is movably supported on a circular track consisting of a number of guide roller rows 18 and 18' on a base 17 via annular rails 16 and 16' attached to the lower part of the annular members 9 and 9'. . Note that some of the rollers in the outer roller row 18' are driven by an electric drive device 19.
It can be rotated freely by. On the other hand, a lever 21 having a guide roller 20 is fixed to one end of the support shaft so that the lever 21 can move along an annular guide rail 22 laid on the base 17. An annular hood 23 disposed above the pallet 2 is suspended by a frame (not shown), and is connected to a coke cooling gas takeout pipe 24 that passes upward through the grate.
A, 24b and 24c are connected to the base, and an annular wind box 25 having cooling gas supply pipes 24a', 24b' and 24c' is fixed to the base at the lower part of the pallet. The annular gap between the inner and outer walls of the pallet, the hood 23, and the wind box 25 is isolated from the outside air by water sealing devices 26 and 26'.
The lower part of the wind box has a plurality of hopper parts 25a and 2
5b, and the coke discharge part 27
The bottom part of the hopper other than the hopper part 25b is connected to an annular conveyor 29 via a gas seal valve 28 so that dust in the hopper can be collected. A partition wall 31 is provided to divide the gas chamber in the hood into a plurality of compartments 32a, 32b, 32c, 3 in the circumferential direction with coke loaded on the pallet.
2d and 32e, and dead plates 33 are installed at multiple locations within the wind box 25 at the bottom of the pallet.
A swinging seal plate 35 and a side wall connecting beam 10 are provided with a partition wall 34 having a fixedly attached partition wall 34 and provided at the lower part of the edge on the forward side of the pallet, that is, on the Z side in the direction of the arrow.
compartments 32 respectively corresponding to the compartments in the hood in cooperation with a seal plate 36 protruding from the lower part of the hood.
a', 32b', 32c', 32d' and 32e' are formed, and gas circulation passages 24a-24a'-3 pass upwardly through the grate via a blower (not shown).
2c'-32c-24c-24b'-32b'-32b
-24b-24c'-32a'-32a-24a are formed in sequence. Note that the compartments within the wind box are shown in parentheses in FIG.

Next, the red hot coke 15 conveyed from a coke oven (not shown) is charged onto the pallet 2 from the supply section 14, is extinguished and cooled while being moved, and is then transferred from the hopper section 25b of the discharge section 27 by a discharge device (not shown). The coke discharge section 27 of the annular guide rail 22 has an appropriate amount of coke in the forward and backward direction of the pallet traveling direction (direction Z of the arrow). There is a pair of upper and lower chevron-shaped rail portions 22a having an inclined portion, and when the guide roller 20 at the end of the pallet support shaft 11 passes through the chevron-shaped rail portions, the pallet 2 is tilted around the support shaft and placed on the grate 6. coke 1
5 is discharged to the hopper section 25b, and then the guide roller moves again to the horizontal portion of the guide rail 22, and the pallet returns to the horizontal state and advances to the coke supply section 14 again.

However, in the conventional apparatus described above, the pallet is tilted and the red hot coke flows into the hopper section 25.
When the coke falls into the gap 37 between the side wall connecting beam 10 and the support shaft 11 (Fig. 3), a portion of the coke falls into the gap 37 between the side wall connecting beam 10 and the support shaft 11 (Fig. Lumps of coke may get caught in the gaps, making it impossible for the pallet to tilt and return to a horizontal position, which can damage the pallet and its rotational drive equipment-related components, making it impossible to operate the equipment. There are disadvantages such as stopping. As a preventive measure against such problems, the first idea is to widen the gap between the support shaft and the side wall connecting beam. Since it is necessary to move to the forward side,
The position of the center of gravity of the pallet becomes further away from the center of the support shaft, and the pallet tilting moment in the discharge section 13 increases, causing the support shaft and the lever 2
It becomes necessary to increase the strength and rigidity of various members such as 1 and the guide roller 20, which increases equipment costs, and there is also a limit to the expansion of the gap due to restrictions on the overall length of the pallet and its mounting pitch. , it is possible to accommodate all coke lump shapes.

This idea was developed in view of the current situation, and a swingable seal plate is installed at the bottom of the rear edge of a box-shaped frame with a grate attached to the upper surface to form a separated pallet. By hanging freely and sliding on the dead plate inside the wind box, it cooperates with the seal plate protruding from the bottom of the connecting beam that connects the inside and outside walls almost radially. A gas seal is provided between each compartment of the connecting beam, and the upper end edge of the connecting beam extends at least over the entire width of the frame on the backward side side of the connecting beam, and is appropriately inclined toward the forward moving side. A protective plate is fixedly installed, and the protective plate and the seal plate form a guide surface for coke that falls from the succeeding pallet when the pallet is tilted, thereby preventing coke from being caught in the gap between the connecting beam and the pallet support shaft. It is an object of the present invention to provide a horizontally rotating grate machine that prevents wear of both of the members.

Next, to explain the drawings showing the embodiment of this invention, in Figs. 4 and 5, the rearward side edge member of the box-shaped frame 5 which constitutes the separated pallet 2 with the grate 6 attached to the upper surface is shown. A swingable seal plate 38 extending in the width direction of the pallet, that is, in a direction perpendicular to the plane of the paper facing FIG. The lower edge is a wind box 25
As the pallet advances, it slides on a dead plate 33 at the upper part of the wind box together with a seal plate 36 protruding from the lower edge of the connecting beam 10 connecting the inner and outer annular side walls 7 and 7'. Each compartment 32a', 32b', formed in the circumferential direction within the
Gas is sealed between 32c', 32d' and 32e'. Further, the width of both seal plates is at least equal to the width of the pallet, and the thickness and material of the plates are selected to be sufficiently resistant to sliding wear caused by falling coke 15. Further, the backward side side surface of the connecting beam has a length at least equal to the pallet width, and the upper edge of the width protrudes above at least the upper surface of the connecting beam. A protection plate 41 extending to the vicinity of the lower end edge and slightly inclined toward the forward side is fixedly provided. The width and angle of inclination of the protection plate are such that when the pallet is tilted, the protection plate and the swinging seal plate are piled up so that the coke 15 falling from the succeeding pallet is placed in the lower hopper portions 25a and 2.
It is formed so that it can flow down to 5b. Note that both ends 5a of the upper part of the protection plate are cut out so as not to touch the box-shaped frame 5 when it is tilted.

Therefore, according to this invention, when the pallet 2 is tilted in the coke discharge section 13 and the coke 15 falls, the seal plate 38 and the protection plate 41 of the preceding pallet overlap to form a chute. , coke falling from the succeeding pallet 15
Since all of the coke is led out to the lower hopper, the coke does not fall into the gap 37 between the support shaft and the connecting beam, and the coke does not get caught.Therefore, both of the members are prevented from being worn out. It can significantly extend lifespan.

As mentioned above, with this invention, there is no need to widen the gap between the pallet support shaft and the connecting beam in accordance with the coke particle size, so the distance between the pallet center of gravity and the support shaft center can be freely selected. , the pallet tilting moment can be determined to the minimum necessary value, which makes it possible to economically design the parts related to the tilting device, including the support shaft, and also prevents wear and tear of the support shaft etc. by eliminating coke clogging. The practical benefits of this idea are enormous.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a conventional coke dry cooling system, Fig. 2 is a view taken along arrow A-A in the previous figure, and Fig.
The figures are a view taken along the line B-B in Fig. 1, Fig. 4 is a longitudinal cross-sectional side view of the main parts showing the advancing state and tilting state of the pallet showing an embodiment of this invention, and Fig. 5 is a
It is a sectional view showing the CC cut plane of the previous figure in the right half and the D-D cut plane in the left half. 2...Separated pallet, 5...Box-shaped frame,
6... Grate, 7... Annular inner wall, 7'... Annular outer wall, 10... Connecting beam, 11... Support shaft, 25
... Wind box, 38 ... Swing type seal plate, 41
...Protection board.

Claims (1)

[Scope of utility model registration request] A grate is attached to the top surface to form a separate pallet, and a swinging seal plate is swingably hung from the lower edge of the rearward side of the box-shaped frame that can be tilted around the support shaft to form a dead plate inside the wind box. By sliding the top, it cooperates with the seal plate protruding from the bottom of the connecting beam, which connects both the inside and outside walls almost radially, and seals the gas between each compartment in the wind box. A protection plate is fixed to the rearward side side surface of the connecting beam, the upper edge of which extends at least over the entire width of the frame, protrudes from at least the upper surface of the connecting beam, and is appropriately inclined toward the forward side, and the protective plate and the seal plate A horizontally rotating grate machine characterized by forming a guide surface for coke falling from a succeeding pallet when the pallet is tilted.